Calman takes advantage of the Offhollywood OMOD features to calibrate a video display with a 10-bit 33x33x33 3D cube lookup table (LUT). This setup guide assists you in calibrating the Offhollywood OMOD with the Calman 3DLUT workflow.
Calman Required Version
- Version 5.7.0 or newer
Calman Recommended Workflow
- 3D LUT (Formerly ColorCube)
Offhollywood OMOD Required Firmware
- Version v1.2.0 r26460 or newer
Offhollywood OMOD Control Ports:
- USB Mini B
Offhollywood OMOD Computer Connection
To connect an Offhollywood OMOD to a computer for automated control:
- Connect the OMOD to your Calman calibration computer via USB or WiFi
- Connect the OMOD SDI 1 output signal to the video display to be calibrated (no input signal is required to the OMOD during display calibration).
- Power on the OMOD.
Offhollywood OMOD Output Format
During display calibration, the internal OMOD pattern generator provides the output signal. The OMOD output signal format is normally a pass-thru version of the input signal format. With no input signal, the OMOD output defaults to 720p59. If desired, you can manually select the resolution of the pattern generator output signal, on the CalMAN Source Settings tab.
Calman 3D LUT Display Calibration
Calman can create a display calibration 3D LUT in the Offhollywood OMOD with a direct control connection.
To produce an optimized 3D LUT calibration file and automatically load it into the OMOD:
From the Calman main menu, select Open Workflow Template / 3D LUT
Proceed through each step of the Color Cube workflow in the normal fashion, using the following notes for OMOD specifics.
Session Setup – Meter Connect
- Connect your color meter to the Calman computer.
- On the Session Setup workflow page, click the Find Meter button to connect your meter.
- Under the Target Display Type drop down, select the backlight type for the display being calibrated.
Session Setup – Source Connect
- On the Session Setup workflow page, click the Find Source button.
- On the Find Source dialog, under Manufacturer, select ‘Offhollywood.’
- Under Model, select ‘OMOD Test Pattern Generator.’
- Enter an IP address of 192.168.100.1 (unless the IP address has been changed on the OMOD web page interface).
- Click Connect.
Calman defaults to having the OMOD test pattern output resolution match the OMOD input signal source resolution. If there is no input signal, the OMOD output resolution defaults to 720p59. If you wish to change the resolution of the OMOD test patterns, make your selection in the Output Resolution selection box on the Calman Source Settings screen
Session Setup – LUT Device connect
- On the Session Setup workflow page, click the Find 3D LUT Device button.
- On the Find Display dialog (Figure 4), under Manufacturer, select ‘Offhollywood.’
- Under Model, select ‘Offhollywood – OMOD (3D LUT).’
- Enter the IP address of the OMOD box.
Note: If you have already connected to OMOD as a source, you do not need to re-
enter the IP address.
- Click Connect.
Display Mode Selection
Before calibrating a display connected to the OMOD output, any 3D LUT already enabled in the OMOD needs to be disabled. On the CalMAN Display Control tab, under Display Mode Selection select Off to disable 3D LUTs.
After creating a 3D LUT in Calman and loading it into the OMOD, the 3D LUT needs to be enabled in the OMOD. On the Calman Display Control tab, under Display Mode Selection, select Calman AutoCal, or whatever you named the new LUT to enable the LUT and then perform display validation in the Color Cube workflow.
Display Calibration section
In the Display Calibration section of the Color Cube workflow, there are provisions for calibrating both a 1D RGB LUT (1D Ramp LUT page) and a 3D cube LUT (3D Cube LUT page). When we are calibrating the OMOD with a 3D LUT, we will skip the 1D Ramp LUT page (1D RGB LUT) and use only the 3D Cube LUT page.
1D Ramp LUT page
- Skip over this page when creating a 3D LUT file for an OMOD, since we will not create a 1D LUT.
3D Cube LUT page
- On the 3D Cube LUT page, click the AutoCal button (rotating arrows) at the right end of the meter action buttons. The AutoCal Setup dialog then appears.
- Under 3D LUT Preset, select an existing 3D LUT preset to recalibrate, or select “New Preset” and edit the New Preset name for the LUT file that CalMAN will create (e.g. monitor ID and date).
- Caution: If you select an existing 3D LUT preset to recalibrate, the existing LUT data will be erased and new LUT data will be loaded to the preset.
- Under File Path, select the desired directory path and provide a name for the backup LUT file that CalMAN will save to disk.
- Under Calibration Type, select the desired type of 3D LUT calibration process.
- IR Profile (time based): Creates the best quality display calibration 3D LUT possible in the selected period of time. You select how much display quality you have time for, from 30 minutes to maximum display quality (6,000 points max). Uses Intelligent Resolution Profiling to search out the most nonlinear color space areas and correct those first.
- IR Profile (point based): Creates the best quality display calibration 3D LUT possible with the selected number of measurement points (1,000 – 10,000 points). Uses Intelligent Resolution Profiling to search out the most nonlinear color space areas and correct those first.
- Lightning LUT: Creates a display calibration 3D LUT in five minutes or less. Produces a very high quality result on professional displays with moderate linearity. Displays with significant nonlinearity may produce marginal results.
- Under Video Range, select “SMPTE (16-235)” if the OMOD range is set to limited on input and output or if you are calibrating a video display that clips signal values above reference white. Select “SMPTE+ (16-255)” if you are calibrating video levels and the OMOD range is set to extended on input and output.
- Click OK.
When the AutoCal process completes, CalMAN automatically loads the optimized 10-bit 33x33x33 LUT calibration data into the Offhollywood OMOD.
Note: To see the new 3D LUT preset in the CalMAN preset list, you need to disconnect and reconnect to OMOD on the CalMAN Display Control tab.
3D LUT File Creation for Offhollywood OMOD
Calman can also create a 3D LUT display calibration file for the OMOD without immediately loading the file into the OMOD. The OMOD does not need to be available during this display calibration and file creation process. The file created will be a .cube file with the proper OMOD data format for later loading into the OMOD with Calman
To create a 3D LUT display calibration file for the OMOD with Calman:
- In the Calman main menu, select Open Workflow Template, then select the ‘Color Cube (3D LUT)’ workflow.
- On the Calman Display Control tab, connect to the SpectraCal Cube Generator as a Display Control device.
- On the Display Control tab, under ‘File Format,’ select ‘Offhollywood – OMOD (.cube).’
- On the Display Control tab, under ‘File Path,’ select your desired destination for the .cube LUT file.
- On the Calman Source Settings tab, select your desired test pattern source for display calibration (this can be the OMOD, if available).
- Follow the display calibration instructions in the ‘Calman 3D LUT Display Calibration section above.
Done: Upon completion of the AutoCal 3D LUT calibration process, Calman automatically writes a .cube file, containing color cube display calibration data, to your selected file destination. This display calibration file can be later loaded to an OMOD, using the procedure in the “3D LUT File Load to Offhollywood OMOD” section
3D LUT File Load to Offhollywood OMOD
Calman can load a properly formatted 3D LUT file into the OMOD. The LUT needs to be a .cube LUT file with 33x33x33 data points.
This . cube LUT file can be a display calibration LUT created with the Calman Cube Generator function (as detailed above). Or, it can be a creative (look) LUT created by any other application (with the proper data points). During the load process, Calman converts the .cube file into the file format required by the OMOD.
To load a 3D LUT file into an OMOD:
- In Calman, on the Display Control tab, connect to the OMOD as a Display Control device.
- On the Display Control tab, click the ‘Open DDC Window’ button.
- On the DDC Controls dialog, scroll to the ‘3D LUT Controls’ page.
- Click the ‘Load LUT File’ button.
- In the resulting file navigation window, select the .cube LUT file that has been created for the OMOD.
Note: You can also load a LUT via the OMOD web page that comes up in a web browser when you enter the OMOD IP address into the browser.
Done: The selected 3D LUT file is now contained in the OMOD.
If you wish to validate the accuracy of the display after loading a 3D calibration LUT, you can return to the Display Validation section of the Color Cube workflow.